How to use

setDoInput

method

in

java.net.HttpURLConnection

protected void setupDoInputOutputFlag() {
  conn.setDoInput(true);
  conn.setDoOutput(true);
}

/**
 * Template method for preparing the given {@link HttpURLConnection}.
 * <p>The default implementation prepares the connection for input and output, and sets the HTTP method.
 * @param connection the connection to prepare
 * @param httpMethod the HTTP request method ({@code GET}, {@code POST}, etc.)
 * @throws IOException in case of I/O errors
 */
protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {
  if (this.connectTimeout >= 0) {
    connection.setConnectTimeout(this.connectTimeout);
  }
  if (this.readTimeout >= 0) {
    connection.setReadTimeout(this.readTimeout);
  }
  connection.setDoInput(true);
  if ("GET".equals(httpMethod)) {
    connection.setInstanceFollowRedirects(true);
  }
  else {
    connection.setInstanceFollowRedirects(false);
  }
  if ("POST".equals(httpMethod) || "PUT".equals(httpMethod) ||
      "PATCH".equals(httpMethod) || "DELETE".equals(httpMethod)) {
    connection.setDoOutput(true);
  }
  else {
    connection.setDoOutput(false);
  }
  connection.setRequestMethod(httpMethod);
}

 private HttpURLConnection post(final String path, final byte[] body) throws IOException {
  final URL url = new URL(masterEndpoint() + path);
  final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
  connection.setRequestMethod("POST");
  connection.setRequestProperty("Content-Type", "application/json");
  connection.setDoInput(true);
  connection.setDoOutput(true);
  connection.getOutputStream().write(body);
  return connection;
 }
}

public static Bitmap returnBitMap(String url) {
  URL myFileUrl = null;
  Bitmap bitmap = null;
  try {
    myFileUrl = new URL(url);
  } catch (MalformedURLException e) {
    e.printStackTrace();
  }
  try {
    HttpURLConnection conn = (HttpURLConnection) myFileUrl
        .openConnection();
    conn.setDoInput(true);
    conn.connect();
    InputStream is = conn.getInputStream();
    bitmap = BitmapFactory.decodeStream(is);
    is.close();
  } catch (IOException e) {
    e.printStackTrace();
  }
  return bitmap;
}

/**
 * 设置http请求默认属性
 *
 * @param httpConnection
 */
protected void setHttpRequest(HttpURLConnection httpConnection) {
  //设置连接超时时间
  httpConnection.setConnectTimeout(this.timeOut * 1000);
  //User-Agent
  httpConnection.setRequestProperty("User-Agent",
      HttpClient.USER_AGENT_VALUE);
  //不使用缓存
  httpConnection.setUseCaches(false);
  //允许输入输出
  httpConnection.setDoInput(true);
  httpConnection.setDoOutput(true);
}

public void configure(HttpURLConnection httpURLConnection) throws ProtocolException {
  httpURLConnection.setRequestMethod(requestMethod);
  httpURLConnection.setDoInput(true);
  httpURLConnection.setDoOutput(true);
  httpURLConnection.setReadTimeout(readTimeoutInMillis);
  if (contentType != null) httpURLConnection.setRequestProperty("Content-Type", contentType);
  if (authorization != null) httpURLConnection.setRequestProperty("Authorization", authorization);
  httpURLConnection.setRequestProperty("User-Agent", userAgent);
}

  @Override
  public void run() {
    try {
      HttpURLConnection connection =
          (HttpURLConnection) new java.net.URL(url).openConnection();
      connection.setDoInput(true);
      connection.connect();
      InputStream input = connection.getInputStream();
      Bitmap bitmap = BitmapFactory.decodeStream(input);
      Listener listener = listenerWeakReference.get();
      if (listener != null) {
        listener.onBitmapDownloadSuccess(url, bitmap);
      }
    } catch (Throwable t) {
      t.printStackTrace();
      Listener listener = listenerWeakReference.get();
      if (listener != null) {
        listener.onBitmapDownloadFailure(url);
      }
    }
  }
}

/**
 * Template method for preparing the given {@link HttpURLConnection}.
 * <p>The default implementation prepares the connection for input and output, and sets the HTTP method.
 * @param connection the connection to prepare
 * @param httpMethod the HTTP request method ({@code GET}, {@code POST}, etc.)
 * @throws IOException in case of I/O errors
 */
protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {
  if (this.connectTimeout >= 0) {
    connection.setConnectTimeout(this.connectTimeout);
  }
  if (this.readTimeout >= 0) {
    connection.setReadTimeout(this.readTimeout);
  }
  connection.setDoInput(true);
  if ("GET".equals(httpMethod)) {
    connection.setInstanceFollowRedirects(true);
  }
  else {
    connection.setInstanceFollowRedirects(false);
  }
  if ("POST".equals(httpMethod) || "PUT".equals(httpMethod) ||
      "PATCH".equals(httpMethod) || "DELETE".equals(httpMethod)) {
    connection.setDoOutput(true);
  }
  else {
    connection.setDoOutput(false);
  }
  connection.setRequestMethod(httpMethod);
}

/** Downloads the content of the specified url to the array. The array has to be big enough. */
private int download (byte[] out, String url) {
  InputStream in = null;
  try {
    HttpURLConnection conn = null;
    conn = (HttpURLConnection)new URL(url).openConnection();
    conn.setDoInput(true);
    conn.setDoOutput(false);
    conn.setUseCaches(true);
    conn.connect();
    in = conn.getInputStream();
    int readBytes = 0;
    while (true) {
      int length = in.read(out, readBytes, out.length - readBytes);
      if (length == -1) break;
      readBytes += length;
    }
    return readBytes;
  } catch (Exception ex) {
    return 0;
  } finally {
    StreamUtils.closeQuietly(in);
  }
}

/**
 * 根据一个网络连接(String)获取bitmap图像
 *
 * @param imageUri
 * @return
 */
public static Bitmap getNetBitmap(String imageUri) {
  // 显示网络上的图片
  Bitmap bitmap = null;
  try {
    URL myFileUrl = new URL(imageUri);
    HttpURLConnection conn = (HttpURLConnection) myFileUrl
        .openConnection();
    conn.setDoInput(true);
    conn.connect();
    InputStream is = conn.getInputStream();
    bitmap = BitmapFactory.decodeStream(is);
    is.close();
  } catch (OutOfMemoryError e) {
    e.printStackTrace();
    bitmap = null;
  } catch (IOException e) {
    e.printStackTrace();
    bitmap = null;
  }
  return bitmap;
}

  this.conn.setRequestMethod(this.method.toString());
} catch (ProtocolException e) {
  throw new HttpException(e.getMessage(), e);
this.conn.setDoInput(true);
if (Method.POST.equals(this.method) || Method.PUT.equals(this.method) || Method.PATCH.equals(this.method) || Method.DELETE.equals(this.method)) {
  this.conn.setDoOutput(true);
  this.conn.setUseCaches(false);

private HttpURLConnection createConnection(URL url, String method, boolean doOutput) {
  HttpURLConnection con;
  try {
    con = (HttpURLConnection) url.openConnection();
    con.setRequestMethod(method);
    con.setConnectTimeout(connectTimeout);
    con.setReadTimeout(readTimeout);
    con.setDoOutput(doOutput);
    con.setDoInput(true);
    con.setUseCaches(false);
    con.setRequestProperty("Content-Type", "text/plain");
    return con;
  } catch (IOException e) {
    e.printStackTrace();
    return null;
  }
}

HttpURLConnection connection = null;
try {
  connection = (HttpURLConnection) (new URL(metaServerEndpoint).openConnection());
  connection.setConnectTimeout(1000);
  connection.setReadTimeout(500);
  connection.setDoInput(true);
  in = new InputStreamReader(connection.getInputStream());
  String content = CharStreams.toString(in);

  this.conn.setRequestMethod(this.method.toString());
} catch (ProtocolException e) {
  throw new HttpException(e.getMessage(), e);
this.conn.setDoInput(true);
if (Method.POST.equals(this.method) || Method.PUT.equals(this.method) || Method.PATCH.equals(this.method) || Method.DELETE.equals(this.method)) {
  this.conn.setDoOutput(true);
  this.conn.setUseCaches(false);

private HttpURLConnection createConnection(URL url, String method, boolean doOutput) {
  HttpURLConnection con;
  try {
    con = (HttpURLConnection) url.openConnection();
    con.setRequestMethod(method);
    con.setConnectTimeout(connectTimeout);
    con.setReadTimeout(readTimeout);
    con.setDoOutput(doOutput);
    con.setDoInput(true);
    con.setUseCaches(false);
    con.setRequestProperty("Content-Type", "text/plain");
    return con;
  } catch (IOException e) {
    e.printStackTrace();
    return null;
  }
}

private String postQuery(String endPoint, String json) throws IOException {
  URL url = new URL(endPoint);
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  conn.setConnectTimeout(5000);
  conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
  conn.setDoOutput(true);
  conn.setDoInput(true);
  conn.setRequestMethod("POST");
  OutputStream os = conn.getOutputStream();
  os.write(json.getBytes("UTF-8"));
  os.close();
  // read the response
  InputStream in = new BufferedInputStream(conn.getInputStream());
  String result = null;
  try (Scanner scanner = new Scanner(in, "UTF-8")) {
    result =  scanner.useDelimiter("\\A").next();
  }
  in.close();
  conn.disconnect();
  return result;
}

private static HttpURLConnection getHttpConnection(String url, String method, Map<String, String> headers) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
  URL _url = new URL(url);
  HttpURLConnection conn = (HttpURLConnection)_url.openConnection();
  if (conn instanceof HttpsURLConnection) {
    ((HttpsURLConnection)conn).setSSLSocketFactory(sslSocketFactory);
    ((HttpsURLConnection)conn).setHostnameVerifier(trustAnyHostnameVerifier);
  }
  
  conn.setRequestMethod(method);
  conn.setDoOutput(true);
  conn.setDoInput(true);
  
  conn.setConnectTimeout(19000);
  conn.setReadTimeout(19000);
  
  conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
  conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");
  
  if (headers != null && !headers.isEmpty()) {
    for (Entry<String, String> entry : headers.entrySet()) {
      conn.setRequestProperty(entry.getKey(), entry.getValue());
    }
  }
  
  return conn;
}
 

public HttpURLConnection createConnection(String urlStr) throws IOException {
  URL url = new URL(urlStr);
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  // Will yield in a POST request: conn.setDoOutput(true);
  conn.setDoInput(true);
  conn.setUseCaches(true);
  conn.setRequestProperty("Referrer", referrer);
  conn.setRequestProperty("User-Agent", userAgent);
  // suggest respond to be gzipped or deflated (which is just another compression)
  // http://stackoverflow.com/q/3932117
  conn.setRequestProperty("Accept-Encoding", acceptEncoding);
  conn.setReadTimeout(timeout);
  conn.setConnectTimeout(timeout);
  return conn;
}

 /**
  * Creates an HTTP connection to the configured endpoint address. This
  * connection is setup for a POST request, and uses the content type and
  * accept header values in the configuration.
  *
  * @return the connection object
  * @throws IOException on any connection error
  */
 public HttpURLConnection getConnection() throws IOException {
  HttpURLConnection connection = (HttpURLConnection)
    endpointUrl.openConnection();
  connection.setRequestMethod("POST");
  connection.setRequestProperty("Content-Type", contentTypeHeader);
  connection.setRequestProperty("Accept", acceptHeader);
  connection.setConnectTimeout(connectTimeout);
  connection.setReadTimeout(requestTimeout);
  connection.setDoOutput(true);
  connection.setDoInput(true);
  connection.connect();
  return connection;
 }
}

private static HttpURLConnection getHttpConnection(String url, String method, Map<String, String> headers) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
  URL _url = new URL(url);
  HttpURLConnection conn = (HttpURLConnection)_url.openConnection();
  if (conn instanceof HttpsURLConnection) {
    ((HttpsURLConnection)conn).setSSLSocketFactory(sslSocketFactory);
    ((HttpsURLConnection)conn).setHostnameVerifier(trustAnyHostnameVerifier);
  }
  
  conn.setRequestMethod(method);
  conn.setDoOutput(true);
  conn.setDoInput(true);
  
  conn.setConnectTimeout(19000);
  conn.setReadTimeout(19000);
  
  conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
  conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");
  
  if (headers != null && !headers.isEmpty())
    for (Entry<String, String> entry : headers.entrySet())
      conn.setRequestProperty(entry.getKey(), entry.getValue());
  
  return conn;
}